Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e9c94a16fd4641a67e79ae1d33fd0c2531b1926a4e8f41cb6edea71ae63ddf' 
  AND token = 'hmhQpbx+LlnOaVp73zp8ABC8ex5fvTThm4r14HCT9VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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