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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5d9e45a2f55edcb175c2ffcf2b9a117aa66e0233d799936bd1cd8341910edec1' 
  AND token = 'IkoEhWmIdWtAEDw+Vz00L0sbKEcVlB44VzXgV3/jaB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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