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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f102bfd288361181a1e9ebeffc4592b4aec6096291457394fcc9cc2ee53c12b6' 
  AND token = 'iBMewA8k7W6gEQLDEBCEwPkyaXBEqt8PwnJL5497/sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}