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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b7c6462f2c4b37a1f6339584dbe295d78070de3b88df973713f62f8f7950dac4' 
  AND token = 'hZpoQI0/XmJJ2yoTBHoCf8MDNap2HtTwQ3ooT5TwdfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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