Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca7c81c1c5edd650a7a7f13cd9dfffb4352f54a725ae09e5fe6f2dfb5d64f658' 
  AND token = 'dEXr4l+UnSYNW/VeM67CpB0eusdslJDgb0YlkZzxPwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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