SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '386d44ca4ebe97444aeb23115ae80a6e7136b5d9673838d70b78854cdfe9e300' 
  AND token = 'r7Y5Kfm4hYoj5i/4uVQ6imF/PzaLcgNDMOpruJeC+fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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