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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'afda6263c784915dd30857d8d6c2e088fa21dfec141e89fd16ff5dc1e54a6d0f' 
  AND token = '5rWRqZQU53Npl4iykYvfKndLiGn50WWUCHbJVe3CiAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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