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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '79ec390db3c3d909d39797d416f9b8d0149d74a096fa69b63854e0b5e6b0606d' 
  AND token = 'U7vwperiBxJhv3l93N0voTTAYJhjxEiRdG3gDnm0xvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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