Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccbb92a7686ac653c149a4b878ee400cf055f0758fa9c507f4df84d87a7b1f18' 
  AND token = 'zLh86PNQE4Tkm/XblfbQYdPb6+dswpfjd5iL3WVjTVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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