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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '42db3a14b4dd7cf18aeaa790eebffaf0ff6aa5b37eaa511d5641c8a66ef3341c' 
  AND token = '8TpKustEFPip/2mHAlyuK/+V26EFL+ZwVpXrCh3J8bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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