Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c33c53cf7e41f2d076ffcad460d3d311355aa2ae5e08a2fed42bca8e5c02457d' 
  AND token = 'rSt/orSUr/DxYx9sRcPZxLXT5QV9CAv2kNwezPKipTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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