SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fdd9425e90e9464dc24642d2f4d908a8380ae278dca33cda817315ef976d2cd8' 
  AND token = '0wqEnGhCZHhGRbzleSUGbGFOj0FgmtBNhxdBRmmYX60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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