Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae50e0230c16561a613f406d069b082be3416f65ee401dfcd5324013dd877f4' 
  AND token = 'pRNGmRzDqEr4tfSffEEyk4U7TwaDCYn//X03hkqfj90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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