Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b97d8327027d6ebf6b635f35b27e94fdfe76a6c568958b0e92410d2dc97f81' 
  AND token = 'Z4R+U3NTA95OBeLD6mfY+yHQgde+PN4dRhdteypW+Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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