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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '72732601630efae04bdd6351dbdf11f88fa4127835ace2dbfc6a64dd1853653d' 
  AND token = 'Vr8x+rT1Xavfp0chfWpzh15jT3hwt6LdeVwHt/A1es8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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