Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e46b3a77bc0dccee2ecc5b48705eb787d5a318b7137f9b9dbfba4ab7763071' 
  AND token = '+ukYU2uwQMqiFesLLFB6Eg3vSeXbq/Y9uPqjnn7aK+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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