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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '261149fde29cb8655f56e1d51ef0577674e6569fbaa590d037541f0f6d61d53c' 
  AND token = 'gLj85oSZpxNLlqTt3gf/BDagJ09XAX+vALZbi+l5uNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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