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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '339e0360dc5781f4744666557f5c331041f485389c2a4255de39c4ba393d590a' 
  AND token = 'bcQuwEXpq0P776sG3Jsi83imuVbFCZFyiE5HcAFjH/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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