Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6eccc74b4cce209b79e8e0ab4cb9cace21dd911f0d7c191f2f413c1605baa27' 
  AND token = 'kJMF9MrMLW+OsBe/PMYSiZJyDprIQNCyYLaL6HX3knw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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