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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd960ce312bb4c9ce663d2f9452c495000dce1b160909bcda8ce5631aae6edb7b' 
  AND token = 'jeT08QVI9VoNTv1HxptLRxqvNpoEocb4R2DkabPk7tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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