Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0beb5ef9092f7b27b06f5af5d3631666bb029af22135b81947b7f8b06e93e8ab' 
  AND token = '5b6q/EDu1+0bNTF0+Xsw6iQ4ZOAPjMjUHsSf8Qnpn0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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