Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7890e85b60d7796fb067a22b8f5ffdc70969338ec3fb86f2fd81e60ce8cf410c' 
  AND token = 'ln8bbaVzKNcYEuxM7KEvdKLuC5EtuT5gBFzS87Mpv1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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