Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6feb2e7696d4b91ab9f7eb2473547862e2893793f2b222517bdff9c894a0908f' 
  AND token = 'Lthm7+7N1bwRPBUjyqf+LjhM8ka8IIII0B5WGFHwQBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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