Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a276ebf1be395340622bf4a79c02268e0f8110ef8477766a35c5c4a2d939bef6' 
  AND token = 'R9/C13BZY1OAIKdZjvE+TqT6l2UxeSAnLyQJjMu2xbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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