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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '998080a57c02fbab146297608bd426e2e588c856a058772fee8292e7ba1ad7f3' 
  AND token = 'mhXWaOw5XKrUW7eocP8Y7XX/7kz/BQApicTfHgZKUo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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