Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad76ec98a0e0d52021f9136b32eb4f5facfb2983cd8820b4e4004bfbef854dd' 
  AND token = 'Xbik0SzBIWtBnkG1jvTWmfPvyy9XcPleGYwhP5mKmBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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