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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '05a712c0453ed1bee92b962e6fa3a7ab39bed86db85ae818377c103fe34bfe76' 
  AND token = 'sl1KmSfw5xG3fvsH0zyTi269Aql9pEl22qfnRWhQk94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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