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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6be1e91c2eef689f77a2aefa6db1127c58233f00fa53724774662bbe11c7a332' 
  AND token = '85t/7U5qyz+0kqarA0RLD4Kow0FBNcJw8w9jbpD282g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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