Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '302e9764c13d99985e48c4ef592af38e685b57777a7bf3a0b3e7e78943bee4da' 
  AND token = '/Tp2bILZcGJOwon5nz5gxexHOLjOUkN331oZwCOMTVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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