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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e9d9f93e7d3da58605f184176a44d6cd9d12453456738898358f2c0ab1273afe' 
  AND token = 'QXr3S/4v+JOF6ilE5YAKApTGIUsG4EP2GyNlzK5iF1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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