Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c8c589a7aabad43b332e939d4360d321f3b4e71398cb3369d6595f44a749e6' 
  AND token = 'mWgifvIepw4ml3iiyWJXKUgq2eIEbMfSnynkK/DqmIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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