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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd0b9b9c20c69636c229db7525aad1a60cabf39748f07d12044598a91a626e95b' 
  AND token = 'iRLCgXy3hUVhakpZGBvEbkocnn2i1etvYs+c9s1LEYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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