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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5f7996fd21d7b8e91fc57c242bd0e11306efee4b59e3dcdaf0d4300ff3e2e971' 
  AND token = '9pOKI4CjcBjrlH16dEGfFf3j0nc3R8Okhhnz4fHwHEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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