Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc0016c20a777f6b6d532114b2fd926dd5c93e70c864908df58ed3e014cecce' 
  AND token = 'xEkmdM25GSw7Uf/ZwNazFpbcqlF6c7hlpOO7lTQ+QNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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