Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe9a923d92efdaf19c21cda896a109f5583ed887e221be67877d812dd4e05286' 
  AND token = 'D84E8eVCBHgPs8ztl+JgA4u0oZXd7OSl0Ve/82S4btA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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