Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31eb1ccb7e6a2363cb708a3ae30776869073f35dc5be62d6b2e5cac439cf5ccb' 
  AND token = 'ufDL/KCd5NS+ayTnxaXEr1EXI/FEsJJHIRtXbuXmPdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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