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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '036959f8fabdf054c247f31fe1a16176d1dbfe2b77a1e39275f6b90fb33b1424' 
  AND token = '4PGVb3RsCs0qq6cTvJGkojCkHRInnwMbz/0cEcmaloU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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