Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d0b3fa2bc813033b3415e615ca63af20167245b2695b862187c0f90518713de' 
  AND token = 'KyzN5tnz10yCGYZWLiUQB9H6MTU/IB6JunSPBq9ECNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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