Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b4832b7eb29e3f9466f0b83d6211662e139b2fa2386ac5b87c36195c943378' 
  AND token = 'FTWUpSDqtPqMOlxHriwUdlTt3UR8fL3qrMlRhulhJYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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