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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '956394351f0dee59c2dd791048955d727f02c98f1f44ffe521f41ff97b3e8528' 
  AND token = 'kqT2hwRWnoGQ7p/7Bjfh059kIGri222dO5pxGPuCd98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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