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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1ab2f7d16ab32b536174bb5055ff18235265ed34b6236d3955c5e485a7b4841c' 
  AND token = '45vIQeFz1iQZLEESBqOLJxZ6udIC5J5+sKlkVfWRmwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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