Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4d3eec53d288b8644713e91381b05af4e7609c6610cf1cd9098a84fbd481365' 
  AND token = '5UnROjB1v4Gnu4wVtSe7TUT2yLCQObr+P9bTnABq3Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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