Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c968718e3288de4e780398b58bd8210d633d67a7d2b88e15eb558499bd24e556' 
  AND token = '4ZYubGl8ZMJN2oObQZiyGlmvYVqdIqoZFw6MBz8+iIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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