Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceff547d335d3133c24a3f56789eba9c30ccdd2740a5a119c0b91d5aaa911947' 
  AND token = 'Ac9E0uk+ur7SvSnhi+5ugWWmA628g43y9UrDXg3FEDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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