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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a332cc0230bc3131f4fb6406882070a2d240ef04742fd8ce20ff69f1892abcf3' 
  AND token = 'fKiQQmBNTZnKTrAd/mBaN52h4RnFwNNfMrgM5VQxjpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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