Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3a97d62065d7efbde0b21685fc4ed6dd5034314bdee26071361cc92d49e20c' 
  AND token = 'XzlWD6S21+oNN5Mh9ET3I1UJ/Ln/EKJzB+AzQ2OKI88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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