Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f4a3f3e0bf701a5806250d564d69b5ca9980189caecdc9ac87b6e3dece68d07' 
  AND token = 'qlva7MBAq618zxyTsujlII1yvBeOaCWJRZDz1YY7hFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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