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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7b2d762f2bee54ff8b641f197869f7d49ecca6a522d4cd7f9193dee347961e4b' 
  AND token = '7MdLRMxobFtNNaYPhDsNIjFXtlizMdtlLJEcOd5I7Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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