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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2aeb3fb2174ddb5263d67ca034fe5a9f881f3f555953fd312eb4fb6be2d2543f' 
  AND token = 'ASA3O2OOvnM0a+cH82IoJ9Mt6xgtVH6QWP0tbT0B9eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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