Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '451f767f77c014f2f62d102755d43892d7a25dd4e3667133586f09c4256462b5' 
  AND token = '97xs8yoOiZ+NgZIStb4L6WeD71dEu3yV6+sn8dS/rcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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