Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e18b028451ba34820a44cf55db9ee499d6e57028658c8cd8b453dced2ec2a1e7' 
  AND token = 'KmB6NHQB7f/eIm/AL7XImK8CcKWGZ3GgnmcpWhiJLko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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