Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d90e70131a6fe6287e8837408d3fd4e669a59fa1e2690c03ca0a6076cad78d' 
  AND token = 'bRrqL7UL6E8aikxIOgkNKW+avVHGSjO96meKTjytLbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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