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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6846a527d9a9d86a04ae9f15118791deceace9110dc11d0cfdc6ee754ca1e29a' 
  AND token = 'YpC8jikCKidAGylTfD2JqsxeE81AIfyOUo1lD2xVa2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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