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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '18f6ff09ee9d8ece8951f9f1b8bcd63f6a19eb652d5547f0656c2a76f6e20a61' 
  AND token = 'VZKra5h/4qa8iMH0nbO2iQo0LcmxwW/+xPNyUiHZLRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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