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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd822b8cfcb2ed4373d761f5a9ac9da2046f92d7283bd3a75d5a48f0ca93a4b69' 
  AND token = 'rHTepbddLfFnZIAeOxgVfPsHKeEKJdPdaimBeqOd5J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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