Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd5506f1a17cbbdc5b28644babe8d485860574407b68a0528ed3a9e7c5771bf' 
  AND token = 'hSM2gNaoNBAAMXtKfBiK3iscQmv12KCL+y0HeXiWxCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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