Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc63f92f6bcfb973637435edf3e7e8efcbb16dd158aac6d29e19b397526960d2' 
  AND token = 'DZgNh+Cj8CcDgWxY+0rZc0y6J1ImGiUQ0Rz3hi37rlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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