Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53f43f549889d12a5338d1883747eaacc0bdd7a86f2569a0e77ae21367aab32b' 
  AND token = '1+AxVG4s+vnMpf9ZHdgJ8clsFAD4I0/usCCRdEgbKQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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