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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '09373d5b89811343ef3baddbba66da51a9733f1b6f5f8cb4271458848139f1e5' 
  AND token = 'gG6MXTL9rw3umPBuiTeeAadCng3kcixjJ5jA6kUSIpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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