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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '89572be99b008d66aefad112fc7656b047d630f605bc1627c6f5b29110a3bce0' 
  AND token = 'A507Z7e3kSYni1Xl4uZ6TxJtuGKZkY3HFh95OKSdmJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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