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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '631224aae0388ffa6f69fd86e6932c71b0ef84c78899d4ff6f68ae6e041d6644' 
  AND token = 'UlxeDeL/7tVHtsT6l2a8qq0NkAjP8dFSKFCSKBCXzaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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