Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '257ba521f7461d6b11b5b034689787b70cdad5500ad4fb3b98a073f90967fdc8' 
  AND token = 'mxzxzj+yC2ULaUDG2kRZeN1JZG04ICNGDWqroZbZ/z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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