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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '578f01b1fec5cc30b68c7b4f40ed55ee788cb6132ebc7d3a6049a5966796be93' 
  AND token = 'CyTpZP0RnX/cA3PmKrqOtpw5a6RRV1NPo9jpp5YufIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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