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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3fa56996b0653601110193631764a594553831cff579420a00f1d2fe9554f4ee' 
  AND token = 'hwgl+SB+xSi6Ey1Nrg/YKkksVwA/tCdGz6kG4R0TcfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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