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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eb66e0ee2c24357d5a155823396d7ab2836915b2e6f152b56577dd165407a49e' 
  AND token = '2IzNBRfoByM3MlRo2/YxwVP/SoqJqMPc3NA5I12A3VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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