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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '108b0802a954be21ec76e2df3e68492304c410217af13d6c629f94fc2b673aab' 
  AND token = 'FCU8nbqxe5cnjWIns9l831u/BdmibDe7t7cg6fmOLrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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