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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4913468d88342e3e6fb13dfbd94882388db926d261aad89c9da9f1aaf3ebad89' 
  AND token = '/XLkcWBOdVIUFw1x1JL0X7JzyAknFmW94H01F4/kH0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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