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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '60506b3e7db90af1657bad3fdab75a3d213e6d2118962c9b9d249ef9d7e1d8e5' 
  AND token = 'ZVo0pTrwDzRpE0Vwt2+I1OclH8yiuioWOLEqa98Jvmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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