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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'cf4a9ac08911d9b132421d21609b6aed23e650057c49a77f1c1c94d272b3c74d' 
  AND token = 'sAUQtp/f69IDS3dbgJ3ZRNYOmeskr4vnVEhE3ZfGp5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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