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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cdb12dd69c75989c9a0f2de8b2ccfdc9f502141de7a349b632818a021ae56e4f' 
  AND token = 'zYY4isr0SV6b0RQBAn9Astl+AOhMYUb4YLnRQSRkyNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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