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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '22cab1b70aac7379caaf35e70cfafbb8707b4fe6ef0e9e8666c9242d2fbfb1ec' 
  AND token = '0BSV90UdbqImoK8AV9LRKy3lgIjReRuic7+jr8McX3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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