Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91639b8fdaee0345f4f4db9f5bbd48bbeeee5e90134c80b8dafa1ba18a63ca7' 
  AND token = 'w5iKDiHqcF0/Y+5Zy0GpAPg5sHPwn34ix8LL0DfZKfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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